<template>
  <view v-if="showPopup" class="uni-popup" @touchmove.stop.prevent="clear">
    <uni-transition :mode-class="['fade']" :styles="maskClass" :duration="duration" :show="showTrans" @click="onTap" />
    <uni-transition :mode-class="ani" :styles="transClass" :duration="duration" :show="showTrans" @click="onTap">
      <view class="uni-popup__wrapper-box" @click.stop="clear">
        <slot />
      </view>
    </uni-transition>
  </view>
</template>

<script>
import { uniTransition } from '@dcloudio/uni-ui'

/**
   * PopUp 弹出层
   * @description 弹出层组件，为了解决遮罩弹层兼容的问题
   * @property {String} type = [top|center|bottom] 弹出方式
   * @value top 顶部弹出
   * @value center 中间弹出
   * @value bottom 底部弹出
   * @property {Boolean} animation = [ture|false] 是否开启动画
   * @property {Boolean} maskClick = [ture|false] 蒙版点击是否关闭弹窗
   * @event {Function} change 打开关闭弹窗触发，e={show: false}
   */

export default {
  name: 'XrPopup',
  components: {
    uniTransition
  },
  props: {
    // 开启动画
    animation: {
      type: Boolean,
      default: true
    },
    // 弹出层类型，可选值，top: 顶部弹出层；bottom：底部弹出层；center：全屏弹出层
    type: {
      type: String,
      default: 'center'
    },
    // maskClick
    maskClick: {
      type: Boolean,
      default: true
    }
  },
  data () {
    return {
      duration: 300,
      ani: [],
      showPopup: false,
      showTrans: false,
      maskClass: {
        position: 'fixed',
        bottom: 0,
        top: 0,
        left: 0,
        right: 0,
        backgroundColor: 'rgba(0, 0, 0, 0.4)'
      },
      transClass: {
        position: 'fixed',
        left: 0,
        right: 0
      }
    }
  },
  watch: {
    type: {
      handler: function (newVal) {
        switch (this.type) {
          case 'top':
            this.ani = ['slide-top']
            this.transClass = {
              position: 'fixed',
              left: 0,
              right: 0
            }
            break
          case 'bottom':
            this.ani = ['slide-bottom']
            this.transClass = {
              position: 'fixed',
              left: 0,
              right: 0,
              bottom: 0
            }
            break
          case 'center':
            this.ani = ['zoom-out', 'fade']
            this.transClass = {
              position: 'fixed',
              /* #ifndef APP-NVUE */
              display: 'flex',
              flexDirection: 'column',
              /* #endif */
              bottom: 0,
              left: 0,
              right: 0,
              top: 0,
              justifyContent: 'center',
              alignItems: 'center',
              boxSizing: 'border-box',
              paddingBottom: '100rpx'
            }

            break
        }
      },
      immediate: true
    }
  },
  created () {
    if (this.animation) {
      this.duration = 300
    } else {
      this.duration = 0
    }
  },
  methods: {
    clear (e) {
      // TODO nvue 取消冒泡
      e.stopPropagation()
    },
    open () {
      this.showPopup = true
      this.$nextTick(() => {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.showTrans = true
        }, 50)
      })
      this.$emit('change', {
        show: true
      })
    },
    close (type) {
      this.showTrans = false
      this.$nextTick(() => {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.$emit('change', {
            show: false
          })
          this.showPopup = false
        }, 300)
      })
    },
    onTap () {
      if (!this.maskClick) return
      this.close()
    }
  }
}
</script>
<style lang="scss" scoped>
  .uni-popup {
    position: fixed;
    /* #ifdef H5 */
    top: var(--window-top);
    /* #endif */
    /* #ifndef H5 */
    top: 0;
    /* #endif */
    bottom: 0;
    left: 0;
    right: 0;
    /* #ifndef APP-NVUE */
    z-index: 99;
    /* #endif */
  }

  .uni-popup__mask {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: $uni-bg-color-mask;
    opacity: 0;
  }

  .mask-ani {
    transition-property: opacity;
    transition-duration: 0.2s;
  }

  .uni-top-mask {
    opacity: 1;
  }

  .uni-bottom-mask {
    opacity: 1;
  }

  .uni-center-mask {
    opacity: 1;
  }

  .uni-popup__wrapper {
    /* #ifndef APP-NVUE */
    display: block;
    /* #endif */
    position: absolute;
  }

  .top {
    top: 0;
    left: 0;
    right: 0;
    transform: translateY(-500px);
  }

  .bottom {
    bottom: 0;
    left: 0;
    right: 0;
    transform: translateY(500px);
  }

  .center {
    /* #ifndef APP-NVUE */
    display: flex;
    flex-direction: column;
    /* #endif */
    bottom: 0;
    left: 0;
    right: 0;
    top: 0;
    justify-content: center;
    align-items: center;
    transform: scale(1.2);
    opacity: 0;
  }

  .uni-popup__wrapper-box {
    /* #ifndef APP-NVUE */
    display: block;
    /* #endif */
    position: relative;
  }
  .content-ani {
    // transition: transform 0.3s;
    transition-property: transform, opacity;
    transition-duration: 0.2s;
  }

  .uni-top-content {
    transform: translateY(0);
  }

  .uni-bottom-content {
    transform: translateY(0);
  }

  .uni-center-content {
    transform: scale(1);
    opacity: 1;
  }
</style>
